Samumed, a San Diego-based biotech is one of the highest valued healthcare startups in the US with a $12 billion valuation. On Monday, the company raised an additional $438 million, bringing its total funding to $650 million. The company is working on treatments to regenerate everything from hair to cartilage. Samumed, a private biotech that's racked up the heady valuation of $12 billion, just raised an additional $438 million at that valuation. The company is developing a pipeline of what could be revolutionary treatments to regenerate hair, skin, bones, and joints.